Since the greatest prime factor of 28 2 + 1 = 785 is 157, which is more than 28 twice, 28 is a Størmer number.  Twenty-eight is a harmonic divisor number ,  a happy number ,  a triangular number ,  a hexagonal number ,  and a centered nonagonal number .
Table Showing Disposition of All Sections of Former Title 28. Title 28. Former Sections. Title 28. New Sections. 1 Court of Claims Rules were replaced by U.S. Claims Court Rules effective Oct. 1, 1982, and subsequently by United States Court of Federal Claims Rules effective Dec. 4, 1992.
Noun: 1. 28 - the cardinal number that is the sum of twenty-seven and one
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File Form G-28 with the related application, petition, or appeal. Don’t forget to sign your form! Also, be sure to have the applicant, petitioner, requestor, or respondent sign the form!
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